LORIS has incorrect access checks in document_repository

{
  "id": "dc4eb482e5df7a19a9ae65be425e808067155253ae78b7449dcfa17e9eb19a73",
  "url": "https://osv.dev/vulnerability/CVE-2026-35165",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LORIS has incorrect access checks in document_repository",
    "summary": "LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 21.0.0 to before 27.0.3 and 28.0.1, while the document_repository frontend was restricting file access, the backend endpoint was not correctly verifying access permissions. A user could theoretically download a file that they should not have access to, if they know or can brute force the filename. This vulnerability is fixed in 27.0.3 and 28.0.1.",
    "evidence": "osv:CVE-2026-35165",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-35165",
      "aliases": [
        "CVE-2026-35165",
        "GHSA-qp6x-qfx7-54wp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/aces/loris",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1abf7fc3858a96b494bd1ef83698fa1900f64eb8"
                },
                {
                  "fixed": "f57f54b42a076bf53ba86e20d4dbf37f63538f58"
                },
                {
                  "introduced": "83141ca814d2b8bda0e483589b726ea27f6ed4f7"
                },
                {
                  "fixed": "c9bb7c87b405b4e0892cda25ab5fc791bcd562f4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "21.0.0"
                      },
                      {
                        "fixed": "27.0.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "28.0.0"
                      },
                      {
                        "fixed": "28.0.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  }
                ]
              }
            }
          ],
          "versions": [
            "28.0.0",
            "v28.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35165.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:20.555617794Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35165.json",
        "https://github.com/aces/Loris/security/advisories/GHSA-qp6x-qfx7-54wp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35165"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35165.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35165",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 486579,
  "published_at": "2026-04-08T18:23:34.101+00:00"
}